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stvvdp2.cpp: implemented vertical cell scroll (Sonic Jam) [Angelo Salese]

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This commit is contained in:
angelosa 2018-05-02 02:29:10 +02:00
parent c9ee85b8b2
commit b5fabb52eb
2 changed files with 70 additions and 5 deletions
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74
src/devices/video/stvvdp2.cpp
View File

@ -1354,7 +1354,6 @@ bit-> /----15----|----14----|----13----|----12----|----11----|----10----|----09
#define STV_VDP2_VCSTAL (m_vdp2_regs[0x09e/2])
/* 1800a0 - LSTA0U - Line Scroll Table Address (NBG0)
bit-> /----15----|----14----|----13----|----12----|----11----|----10----|----09----|----08----\
| -- | -- | -- | -- | -- | -- | -- | -- |
@ -4450,13 +4449,73 @@ void saturn_state::stv_vdp2_check_tilemap(bitmap_rgb32 &bitmap, const rectangle
if ( stv2_current_tilemap.linescroll_enable ||
stv2_current_tilemap.vertical_linescroll_enable ||
stv2_current_tilemap.linezoom_enable )
stv2_current_tilemap.linezoom_enable ||
stv2_current_tilemap.vertical_cell_scroll_enable)
{
stv_vdp2_check_tilemap_with_linescroll(bitmap, cliprect);
// check for vertical cell scroll enable (Sonic Jam)
// TODO: it is unknown how this works with vertical linescroll enable too (probably it doesn't?)
if(stv2_current_tilemap.vertical_cell_scroll_enable)
{
uint32_t vcsc_address;
uint32_t base_mask;
int base_offset, base_multiplier;
int16_t base_scrollx, base_scrolly;
//uint32_t base_incx, base_incy;
int cur_char = 0;
base_mask = STV_VDP2_VRAMSZ ? 0x7ffff : 0x3ffff;
vcsc_address = (((STV_VDP2_VCSTAU << 16) | STV_VDP2_VCSTAL) & base_mask) * 2;
vcsc_address >>= 2;
base_offset = 0;
base_multiplier = 1;
// offset for both enabled
if(STV_VDP2_N0VCSC && STV_VDP2_N1VCSC)
{
// NBG1
if(stv2_current_tilemap.layer_name & 1)
base_offset = 1;
base_multiplier = 2;
}
base_scrollx = stv2_current_tilemap.scrollx;
base_scrolly = stv2_current_tilemap.scrolly;
//base_incx = stv2_current_tilemap.incx;
//base_incy = stv2_current_tilemap.incy;
while(cur_char <= cliprect.max_x)
{
mycliprect.min_x = cur_char;
mycliprect.max_x = cur_char + 8 - 1;
uint32_t cur_address;
int16_t char_scroll;
cur_address = vcsc_address;
cur_address += ((cur_char >> 3) * base_multiplier) + base_offset;
char_scroll = m_vdp2_vram[ cur_address ] >> 16;
char_scroll &= 0x07ff;
if ( char_scroll & 0x0400 ) char_scroll |= 0xf800;
stv2_current_tilemap.scrollx = base_scrollx;
stv2_current_tilemap.scrolly = base_scrolly + (char_scroll);
//stv2_current_tilemap.incx = base_incx;
//stv2_current_tilemap.incy = base_incy;
stv_vdp2_check_tilemap_with_linescroll(bitmap, mycliprect);
// TODO: + 16 for tilemap and char size = 16?
cur_char += 8;
}
}
else
stv_vdp2_check_tilemap_with_linescroll(bitmap, cliprect);
return;
}
if (stv2_current_tilemap.bitmap_enable) // this layer is a bitmap
{
stv_vdp2_draw_basic_bitmap(bitmap, mycliprect);
@ -5090,6 +5149,7 @@ void saturn_state::stv_vdp2_draw_NBG0(bitmap_rgb32 &bitmap, const rectangle &cli
stv2_current_tilemap.linescroll_table_address = (((STV_VDP2_LSTA0U << 16) | STV_VDP2_LSTA0L) & base_mask) * 2;
stv2_current_tilemap.vertical_linescroll_enable = STV_VDP2_N0LSCY;
stv2_current_tilemap.linezoom_enable = STV_VDP2_N0LZMX;
stv2_current_tilemap.vertical_cell_scroll_enable = STV_VDP2_N0VCSC;
stv2_current_tilemap.plane_size = (STV_VDP2_R1ON) ? STV_VDP2_RBPLSZ : STV_VDP2_N0PLSZ;
stv2_current_tilemap.colour_ram_address_offset = STV_VDP2_N0CAOS;
@ -5190,6 +5250,7 @@ void saturn_state::stv_vdp2_draw_NBG1(bitmap_rgb32 &bitmap, const rectangle &cli
stv2_current_tilemap.linescroll_table_address = (((STV_VDP2_LSTA1U << 16) | STV_VDP2_LSTA1L) & base_mask) * 2;
stv2_current_tilemap.vertical_linescroll_enable = STV_VDP2_N1LSCY;
stv2_current_tilemap.linezoom_enable = STV_VDP2_N1LZMX;
stv2_current_tilemap.vertical_cell_scroll_enable = STV_VDP2_N1VCSC;
stv2_current_tilemap.plane_size = STV_VDP2_N1PLSZ;
stv2_current_tilemap.colour_ram_address_offset = STV_VDP2_N1CAOS;
@ -5292,6 +5353,7 @@ void saturn_state::stv_vdp2_draw_NBG2(bitmap_rgb32 &bitmap, const rectangle &cli
stv2_current_tilemap.linescroll_table_address = 0;
stv2_current_tilemap.vertical_linescroll_enable = 0;
stv2_current_tilemap.linezoom_enable = 0;
stv2_current_tilemap.vertical_cell_scroll_enable = 0;
stv2_current_tilemap.colour_ram_address_offset = STV_VDP2_N2CAOS;
stv2_current_tilemap.fade_control = (STV_VDP2_N2COEN * 1) | (STV_VDP2_N2COSL * 2);
@ -5395,6 +5457,7 @@ void saturn_state::stv_vdp2_draw_NBG3(bitmap_rgb32 &bitmap, const rectangle &cli
stv2_current_tilemap.linescroll_table_address = 0;
stv2_current_tilemap.vertical_linescroll_enable = 0;
stv2_current_tilemap.linezoom_enable = 0;
stv2_current_tilemap.vertical_cell_scroll_enable = 0;
stv2_current_tilemap.colour_ram_address_offset = STV_VDP2_N3CAOS;
stv2_current_tilemap.fade_control = (STV_VDP2_N3COEN * 1) | (STV_VDP2_N3COSL * 2);
@ -5713,6 +5776,7 @@ void saturn_state::stv_vdp2_draw_RBG0(bitmap_rgb32 &bitmap, const rectangle &cli
stv2_current_tilemap.linescroll_table_address = 0;
stv2_current_tilemap.vertical_linescroll_enable = 0;
stv2_current_tilemap.linezoom_enable = 0;
stv2_current_tilemap.vertical_cell_scroll_enable = 0;
stv2_current_tilemap.line_screen_enabled = STV_VDP2_R0LCEN;
stv2_current_tilemap.mosaic_screen_enabled = STV_VDP2_R0MZE;

1
src/mame/includes/saturn.h
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@ -343,6 +343,7 @@ public:
uint8_t linescroll_interval;
uint32_t linescroll_table_address;
uint8_t vertical_linescroll_enable;
uint8_t vertical_cell_scroll_enable;
uint8_t linezoom_enable;
uint8_t plane_size;